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83

Feb 24, 2010
02/10

by
bonora

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bonora

Topics: bonora, second family records, experimental

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80

Feb 24, 2010
02/10

by
bonora

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harbatium

Topics: Second Family Records, bonora, experimental

833
833

Dec 28, 2008
12/08

by
Bonora

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bonora - nabucco situation

Topics: Second Family Records, bonora

226
226

Jul 20, 2009
07/09

by
Franz Bonora

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Book digitized by Google from the library of the University of California and uploaded to the Internet Archive by user tpb.

Source: http://books.google.com/books?id=lmJBAAAAIAAJ&oe=UTF-8

199
199

Dec 1, 2012
12/12

by
Francesco Bonora

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8.0

Sep 23, 2013
09/13

by
L. Bonora; A. Sorin

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Using cohomological methods we discuss several issues related to chiral anomalies in noncommutative U(N) YM theories in any even dimension. We show that for each dimension there is only one solution of the WZ consistency condition and that there cannot be any reducible anomaly, nor any mixed anomaly when the gauge group is a product group. We also clarify some puzzling aspects of the issue of the anomaly when chiral fermions are in the adjoint representation.

Source: http://arxiv.org/abs/hep-th/0109204v3

9
9.0

Sep 19, 2013
09/13

by
L. Bonora; V. Bonservizi

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We quantize $sl_n$ Toda field theories in a periodic lattice. We find the quantum exchange algebra in the diagonal monodromy (Bloch wave) basis in the case of the defining representation. In the $sl_3$ case we extend the analysis also to the second fundamental representation. We clarify, in particular, the relation of Jimbo and Rosso's quantum $R$ matrix with the quantum $R$ matrix in the Bloch wave basis.

Source: http://arxiv.org/abs/hep-th/9207101v1

6
6.0

Sep 21, 2013
09/13

by
L. Bonora; S. Krivonos

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A manifestly N=2 supersymmetric coset formalism is applied to analyse the "fermionic" extensions of N=2 $a=4$ and $a=-2$ KdV hierarchies. Both these hierarchies can be obtained from a manifest N=2 coset construction. This coset is defined as the quotient of some local but non-linear superalgebra by a $\hat{U(1)}$ subalgebra. Three superextensions of N=2 KdV hierarchy are proposed, among which one seems to be entirely new.

Source: http://arxiv.org/abs/solv-int/9705001v3

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18

Sep 22, 2013
09/13

by
L. Bonora; M. Salizzoni

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We give an explicit proof that the noncommutative U(N) gauge theories are one-loop renormalizable

Source: http://arxiv.org/abs/hep-th/0011088v5

6
6.0

Sep 18, 2013
09/13

by
L. Bonora; M. Salizzoni

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We discuss the problem of noncommutative SO(N) gauge field theories from the string one-loop point of view. To this end we propose an expression for the string propagator on the boundary of the Moebius strip in the presence of a constant B field. We discuss in detail the problems related to its derivation. Then we use it to compute the one-loop corrections to two-, three- and four-gluon amplitudes in an open string theory with orthogonal Chan-Paton factors. We show that these corrections in the...

Source: http://arxiv.org/abs/hep-th/0105307v4

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25

Jul 20, 2013
07/13

by
L. Bonora; M. Cvitan

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We apply the "trace anomaly method" to the calculation of moments of the Hawking radiation of a Schwarzschild black hole. We show that they can be explained as the fluxes of chiral currents forming a W-infinity algebra. Then we construct the covariant version of these currents and verify that up to order 6 they are not affected by any trace anomaly. Using cohomological methods we show that actually, for the fourth order current, no trace anomalies can exist. The results reported here...

Source: http://arxiv.org/abs/0804.0198v3

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32

Jul 20, 2013
07/13

by
Loriano Bonora; Raffaele Savelli

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In order to describe the appearance in F theory of the non--simply--laced Lie algebras, we use the representation of symmetry enhancements by means of string junctions. After an introduction to the techniques used to describe symmetry enhancement, that is algebraic geometry, BPS states analysis and string junctions, we concentrate on the latter. We give an explicit description of the folding of D_{2n} to B_n of the folding of E_6 to F_4 and that of D_4 to G_2 in terms of junctions and Jordan...

Source: http://arxiv.org/abs/1007.4668v1

6
6.0

Sep 19, 2013
09/13

by
L. Bonora; M. Rinaldi

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We deal with the problem of diffeomorphism anomaly in theories with branes. In particular we thoroughly analyze the problem of the residual chiral anomaly of a five-brane immersed in M-theory, paying attention to its global formulation in the five-brane world-volume. We conclude that the anomaly can be canceled by a {\it local} counterterm in the five-brane world-volume.

Source: http://arxiv.org/abs/hep-th/9912214v2

6
6.0

Sep 18, 2013
09/13

by
L. Bonora; A. Sorin

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We propose a new integrable N=2 supersymmetric Toda lattice hierarchy which may be relevant for constructing a supersymmetric one-matrix model. We define its first two Hamiltonian structures, the recursion operator and Lax--pair representation. We provide partial evidence for the existence of an infinite-dimensional N=2 superalgebra of its flows. We study its bosonic limit and introduce new Lax-pair representations for the bosonic Toda lattice hierarchy. Finally we discuss the relevance this...

Source: http://arxiv.org/abs/hep-th/9710118v1

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23

Sep 22, 2013
09/13

by
L. Bonora; A. Sorin

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The first two Hamiltonian structures and the recursion operator connecting all evolution systems and Hamiltonian structures of the N=2 supersymmetric (n,m)-GNLS hierarchy are constructed in terms of N=2 superfields in two different superfield bases with local evolution equations. Their bosonic limits are studied in detail. New local and nonlocal bosonic and fermionic integrals both for the N=2 supersymmetric (n,m)-GNLS hierarchy and its bosonic counterparts are derived. As an example, in the...

Source: http://arxiv.org/abs/hep-th/9704130v1

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15

Sep 19, 2013
09/13

by
E. Aldrovandi; L. Bonora

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We study the Liouville theory on a Riemann surface of genus g by means of their associated Drinfeld--Sokolov linear systems. We discuss the cohomological properties of the monodromies of these systems. We identify the space of solutions of the equations of motion which are single--valued and local and explicitly represent them in terms of Krichever--Novikov oscillators. Then we discuss the operator structure of the quantum theory, in particular we determine the quantum exchange algebras and...

Source: http://arxiv.org/abs/hep-th/9303064v1

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35

Jul 20, 2013
07/13

by
Loriano Bonora; Stefano Giaccari

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The search for analytic solutions in open string fields theory \`a la Witten often meets with singular expressions, which need an adequate mathematical formalism to be interpreted. In this paper we discuss this problem and propose a way to resolve the related ambiguities. Our claim is that a correct interpretation requires a formalism similar to distribution theory in functional analysis. To this end we concretely construct a locally convex space of test string states together with the dual...

Source: http://arxiv.org/abs/1304.2159v1

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9.0

Sep 21, 2013
09/13

by
L. Bonora; C. S. Xiong

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We show how to calculate correlation functions of two matrix models. Our method consists in making full use of the integrable hierarchies and their reductions, which were shown in previous papers to naturally appear in multi--matrix models. The second ingredient we use are the $W$--constraints. In fact an explicit solution of the relevant hierarchy, satisfying the $W$--constraints (string equation), underlies the explicit calculation of the correlation functions. In the course of our derivation...

Source: http://arxiv.org/abs/hep-th/9311089v3

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6.0

Sep 21, 2013
09/13

by
L. Bonora; C. S. Xiong

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We discuss a differential integrable hierarchy, which we call the (N, M)$--th KdV hierarchy, whose Lax operator is obtained by properly adding $M$ pseudo--differential terms to the Lax operator of the N--th KdV hierarchy. This new hierarchy contains both the higher KdV hierarchy and multi--field representation of KP hierarchy as sub--systems and naturally appears in multi--matrix models. The N+2M-1 coordinates or fields of this hierarchy satisfy two algebras of compatible Poisson brackets which...

Source: http://arxiv.org/abs/hep-th/9311070v1

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19

Jul 20, 2013
07/13

by
L. Bonora; C. S. Xiong

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We show how the two--matrix model and Toda lattice hierarchy presented in a previous paper can be solved exactly: we obtain compact formulas for correlators of pure tachyonic states at every genus. We then extend the model to incorporate a set of discrete states organized in finite dimensional $sl_2$ representations. We solve also this extended model and find the correlators of the discrete states by means of the $W$ constraints and the flow equations. Our results coincide with the ones...

Source: http://arxiv.org/abs/hep-th/9407141v1

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16

Sep 21, 2013
09/13

by
L. Bonora; C. S. Chu

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It has been proposed recently that, in the framework of M(atrix) theory, N=8 supersymmetric U(N) Yang-Mills theory in 1+1 dimensions gives rise to type IIA long string configurations. We point out that the quantum moduli space of $SYM_{1+1}$ gives rise to two quantum numbers, which fit very well into the M(atrix) theory. The two quantum numbers become familiar if one switches to a IIB picture, where they represent configurations of D-strings and fundamental strings. We argue that, due to the...

Source: http://arxiv.org/abs/hep-th/9705137v3

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6.0

Sep 22, 2013
09/13

by
L. Bonora; C. S. Xiong

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We analyze the topological nature of $c=1$ string theory at the self--dual radius. We find that it admits two distinct topological field theory structures characterized by two different puncture operators. We show it first in the unperturbed theory in which the only parameter is the cosmological constant, then in the presence of any infinitesimal tachyonic perturbation. We also discuss in detail a Landau--Ginzburg representation of one of the two topological field theory structures.

Source: http://arxiv.org/abs/hep-th/9505140v3

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11

Sep 19, 2013
09/13

by
L. Bonora; C. S. Xiong

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We show that the most general two--matrix model with bilinear coupling underlies $c=1$ string theory. More precisely we prove that $W_{1+\infty}$ constraints, a subset of the correlation functions and the integrable hierarchy characterizing such two--matrix model, correspond exactly to the $W_{1+\infty}$ constraints, to the discrete tachyon correlation functions and to the integrable hierarchy of the $c=1$ string.

Source: http://arxiv.org/abs/hep-th/9405004v2

6
6.0

Sep 21, 2013
09/13

by
L. Bonora; C. S. Xiong

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We show that there exists an alternative procedure in order to extract differential hierarchies, such as the KdV hierarchy, from one--matrix models, without taking a continuum limit. To prove this we introduce the Toda lattice and reformulate it in operator form. We then consider the reduction to the systems appropriate for one--matrix model.

Source: http://arxiv.org/abs/hep-th/9204019v1

6
6.0

Sep 21, 2013
09/13

by
L. Bonora; C. S. Xiong

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We discuss the integrable hierarchies that appear in multi--matrix models. They can be envisaged as multi--field representations of the KP hierarchy. We then study the possible reductions of this systems via the Dirac reduction method by suppressing successively one by one part of the fields. We find in this way new integrable hierarchies, of which we are able to write the Lax pair representations by means of suitable Drinfeld--Sokolov linear systems. At the bottom of each reduction procedure...

Source: http://arxiv.org/abs/hep-th/9305005v2

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5.0

Sep 18, 2013
09/13

by
L. Bonora; R. P. Malik

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We discuss BRST and anti--BRST transformations for an Abelian antisymmetric gauge field in 4D and find that, in order for them to anticommute, we have to impose a condition on the auxiliary fields. This condition is similar to the Curci-Ferrari condition for the 4D non--Abelian 1-form gauge theories and represents a consistency requirement. We interpret it as a signal that our Abelian 2-form gauge field theory is based on gerbes. To support this interpretation we discuss, in particular, the...

Source: http://arxiv.org/abs/0707.3922v4

9
9.0

Sep 23, 2013
09/13

by
L. Bonora; A. A. Bytsenko

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There is a remarkable connection between quantum generating functions of field theory and formal power series associated with dimensions of chains and homologies of suitable Lie algebras. We discuss the homological aspects of this connection with its applications to partition functions of the minimal three-dimensional gravities in the space-time asymptotic to AdS3, which also describe the three-dimensional Euclidean black holes, the pure N = 1 supergravity, and a sigma model on N-fold...

Source: http://arxiv.org/abs/1105.4571v1

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10.0

Sep 21, 2013
09/13

by
L. Bonora; A. A. Bytsenko

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The purpose of this paper is to provide the reader with a collection of results which can be found in the mathematical literature and to apply them to hyperbolic spaces that may have a role in physical theories. Specifically we apply K-theory methods for the calculation of brane charges and RR-fields on hyperbolic spaces (and orbifolds thereof). It is known that by tensoring K-groups with the rationals, K-theory can be mapped to rational cohomology by means of the Chern character isomorphisms....

Source: http://arxiv.org/abs/hep-th/0602162v2

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14

Sep 20, 2013
09/13

by
L. Bonora; C. S. Xiong

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We derive the discrete linear systems associated to multi--matrix models, the corresponding discrete hierarchies and the appropriate coupling conditions. We also obtain the $W_{1+\infty}$ constraints on the partition function. We then apply to multi--matrix models the technique, developed in previous papers, of extracting hierarchies of differential equations from lattice ones without passing through a continuum limit. In a q--matrix model we find 2q coupled differential systems. The...

Source: http://arxiv.org/abs/hep-th/9212070v2

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13

Sep 22, 2013
09/13

by
L. Bonora; C. S. Xiong

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In the context of hermitean one--matrix models we show that the emergence of the NLS hierarchy and of its reduction, the KdV hierarchy, is an exact result of the lattice characterizing the matrix model. Said otherwise, we are not obliged to take a continuum limit to find these hierarchies. We interpret this result as an indication of the topological nature of them. We discuss the topological field theories associated with both and discuss the connection with topological field theories coupled...

Source: http://arxiv.org/abs/hep-th/9209041v2

10
10.0

Sep 19, 2013
09/13

by
L. Bonora; M. Martellini; C. S. Xiong

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In this paper we analyze one-matrix models by means of the associated discrete linear systems. We see that the consistency conditions of the discrete linear system lead to the Virasoro constraints. The linear system is endowed with gauge invariances. We show that invariance under time-independent gauge transformations entails the integrability of the model, while the double scaling limit is connected with a time-dependent gauge transformation. We derive the continuum version of the discrete...

Source: http://arxiv.org/abs/hep-th/9109054v1

10
10.0

Sep 22, 2013
09/13

by
L. Bonora; C. Reina; A. Zampa

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We show that the geometry of K3 surfaces with singularities of type A-D-E contains enough information to reconstruct a copy of the Lie algebra associated to the given Dynkin diagram. We apply this construction to explain the enhancement of symmetry in F and IIA theories compactified on singular K3's.

Source: http://arxiv.org/abs/hep-th/9807057v1

10
10.0

Sep 20, 2013
09/13

by
L. Bonora; C. Maccaferri; P. Prester

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We analyze the fluctuations of the dressed sliver solution found in a previous paper, hep-th/0311198, in the operator formulation of Vacuum String Field Theory. We derive the tachyon wave function and then analyze the higher level fluctuations. We show that the dressing is responsible for implementing the transversality condition on the massless vector. In order to consistently deal with the singular $k=0$ mode we introduce a string midpoint regulator and we show that it is possible to...

Source: http://arxiv.org/abs/hep-th/0404154v3

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4.0

Sep 23, 2013
09/13

by
L. Bonora; C. P. Constantinidis; E. Vinteler

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We present a new realization of scalar integrable hierarchies in terms of the Toda lattice hierarchy. In other words, we show on a large number of examples that an integrable hierarchy, defined by a pseudodifferential Lax operator, can be embedded in the Toda lattice hierarchy. Such a realization in terms the Toda lattice hierarchy seems to be as general as the Drinfeld--Sokolov realization.

Source: http://arxiv.org/abs/hep-th/9511172v2

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Sep 21, 2013
09/13

by
L. Bonora; D. Mamone; M. Salizzoni

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We continue the analysis of Vacuum String Field Theory in the presence of a constant B field. In particular we give a proof of the ratio of brane tensions is the expected one. On the wake of the recent literature we introduce wedge-like states and orthogonal projections. Finally we show a few examples of the smoothing out effects of the B field on some of the singularities that appear in VSFT.

Source: http://arxiv.org/abs/hep-th/0203188v3

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13

Sep 18, 2013
09/13

by
L. Bonora; C. S. Chu; M. Rinaldi

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We discuss several mechanisms to cancel the anomalies of a 5-brane embedded in M-theory. Two of them work, provided we impose suitable conditions either on the 11-dimensional manifold of M-theory or on the 4-form field strength of M-theory.

Source: http://arxiv.org/abs/hep-th/9710063v2

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6.0

Sep 18, 2013
09/13

by
L. Bonora; M. Schnabl; A. Tomasiello

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Via descent equations we derive formulas for consistent gauge anomalies in noncommutative Yang-Mills theories.

Source: http://arxiv.org/abs/hep-th/0002210v2

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Sep 18, 2013
09/13

by
L. Bonora; S. Krivonos; A. Sorin

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We formulate a conjecture for the three different Lax operators that describe the bosonic sectors of the three possible $N=2$ supersymmetric integrable hierarchies with $N=2$ super $W_n$ second hamiltonian structure. We check this conjecture in the simplest cases, then we verify it in general in one of the three possible supersymmetric extensions. To this end we construct the $N=2$ supersymmetric extensions of the Generalized Non-Linear Schr\"{o}dinger hierarchy by exhibiting the...

Source: http://arxiv.org/abs/hep-th/9604165v3

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4.0

Sep 19, 2013
09/13

by
L. Bonora; F. Nesti; E. Vinteler

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We analyze multi--matrix chain models. They can be considered as multi--component Toda lattice hierarchies subject to suitable coupling conditions. The extension of such models to include extra discrete states requires a weak form of integrability. The discrete states of the $q$--matrix model are organized in representations of $sl_q$. We solve exactly the Gaussian--type models, of which we compute several all-genus correlators. Among the latter models one can classify also the discretized...

Source: http://arxiv.org/abs/hep-th/9506124v1

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14

Sep 21, 2013
09/13

by
L. Bonora; S. Krivonos; A. Sorin

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We discuss a large class of coset constructions of the N=2 sl(n|n-1) affine superalgebra. We select admissible subalgebras, i.e. subalgebras that induce linear chiral/antichiral constraints on the coset supercurrents. We show that all the corresponding coset constructions lead to N=2 matrix GNLS hierarchies. We develop an algorithm to compute the relative Hamiltonians and flows. We spell out completely the case of the N=2 affine sl(3|2), which possesses four admissible subalgebras. The...

Source: http://arxiv.org/abs/solv-int/9711012v2

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6.0

Sep 19, 2013
09/13

by
G. Bonelli; L. Bonora; A. Ricco

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We study open B-model representing D-branes on 2-cycles of local Calabi--Yau geometries. To this end we work out a reduction technique linking D-branes partition functions and multi-matrix models in the case of conifold geometries so that the matrix potential is related to the complex moduli of the conifold. We study the geometric engineering of the multi-matrix models and focus on two-matrix models with bilinear couplings. We show how to solve this models in an exact way, without resorting to...

Source: http://arxiv.org/abs/hep-th/0507224v4

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10.0

Sep 23, 2013
09/13

by
L. Bonora; S. Giaccari; D. D. Tolla

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Recently a possible violation of the equation of motion for the recently proposed lump solutions in open SFT has been pointed out in the literature. In this paper we argue that, when the issue is considered in the appropriate mathematical setting of distribution theory, no violations to the equation of motion occur.

Source: http://arxiv.org/abs/1109.4336v5

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Sep 22, 2013
09/13

by
G. Bonelli; L. Bonora; F. Nesti

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Extending a recent result of S.B. Giddings, F. Hacquebord and H. Verlinde, we show that in the U(N) SYM Matrix theory there exist classical BPS instantons which interpolate between different closed string configurations via joining/splitting interactions similar to those of string field theory. We construct them starting from branched coverings of Riemann surfaces. For the class of them which we analyze in detail the construction can be made explicit in terms U(N) affine Toda field theories.

Source: http://arxiv.org/abs/hep-th/9805071v3

10
10.0

Sep 21, 2013
09/13

by
L. Bonora; S. Giaccari; D. D. Tolla

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This is the follow-up of a previous paper [ArXiv:1105.5926], where we calculated the energy of an analytic lump solution in SFT, representing a D24-brane. Here we describe an analytic solution for a Dp-brane, for any p, and compute its energy.

Source: http://arxiv.org/abs/1106.3914v1

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6.0

Sep 19, 2013
09/13

by
L. Bonora; C. Maccaferri; D. D. Tolla

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We propose a remarkably simple solution of cubic open string field theory which describes inhomogeneous tachyon condensation. The solution is in one-to-one correspondence with the IR fixed point of the RG-flow generated in the two--dimensional world-sheet theory by integrating a relevant operator with mild enough OPE on the boundary. It is shown how the closed string overlap correctly captures the shift in the closed string one point function between the UV and the IR limits of the flow....

Source: http://arxiv.org/abs/1009.4158v3

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Sep 23, 2013
09/13

by
G. Bonelli; L. Bonora; A. Ricco

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This paper is a continuation of hepth/0507224 where open topological B-models describing D-branes on 2-cycles of local Calabi--Yau geometries with conical singularities were studied. After a short review, the paper expands in particular on two aspects: the gauge fixing problem in the reduction to two dimensions and the quantum matrix model solutions.

Source: http://arxiv.org/abs/hep-th/0511152v1

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10.0

Oct 22, 2014
10/14

by
Pozzilli, Paolo; Strollo, Rocky; Bonora, Enzo

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This article is from Journal of Diabetes Investigation, volume 5.AbstractThe United Kingdom Prospective Diabetes Study, and Diabetes Control and Complications Trial have shown that aggressive glucose control, especially early in the natural history of the disease, might result in a significant reduction of microvascular as well as macrovascular complications. However, more recent trials have increased the level of complexity of the relationship between â€˜tight glucose control/chronic...

Source: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4023573

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Jul 20, 2013
07/13

by
L. Bonora; C. S. Chu; M. Rinaldi

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We review some basic notions on anomalies in field theories and superstring theories, with particular emphasis on the concept of locality. The aim is to prepare the ground for a discussion on anomalies in theories with branes. In this light we review the problem of chiral anomaly cancellation in M-theory with a 5-brane.

Source: http://arxiv.org/abs/hep-th/9712205v1

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4.0

Sep 23, 2013
09/13

by
Loriano Bonora; Fabio Ferrari Ruffino; Raffaele Savelli

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We "solve" the Freed-Witten anomaly equation, i.e., we find a geometrical classification of the B-field and A-field configurations in the presence of D-branes that are anomaly-free. The mathematical setting being provided by the geometry of gerbes, we find that the allowed configurations are jointly described by a coset of a certain hypercohomology group. We then describe in detail various cases that arise according to such classification. As is well-known, only under suitable...

Source: http://arxiv.org/abs/0810.4291v1

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15

Sep 22, 2013
09/13

by
G. Bonelli; L. Bonora; F. Nesti

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The Matrix String Theory, i.e. the two dimensional U(N) SYM with N=(8,8) supersymmetry, has classical BPS solutions that interpolate between an initial and a final string configuration via a bordered Riemann surface. The Matrix String Theory amplitudes around such a classical BPS background, in the strong Yang--Mills coupling, are therefore candidates to be interpreted in a stringy way as the transition amplitude between given initial and final string configurations. In this paper we calculate...

Source: http://arxiv.org/abs/hep-th/9807232v2